166531684506 has 128 divisors (see below), whose sum is σ = 390799558656. Its totient is φ = 46795034880.

The previous prime is 166531684477. The next prime is 166531684511. The reversal of 166531684506 is 605486135661.

166531684506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15889740 + ... + 15900216.

It is an arithmetic number, because the mean of its divisors is an integer number (3053121552).

Almost surely, 2^166531684506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166531684506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195399779328).

166531684506 is an abundant number, since it is smaller than the sum of its proper divisors (224267874150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166531684506 is a wasteful number, since it uses less digits than its factorization.

166531684506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10836.

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 166531684506 in words is "one hundred sixty-six billion, five hundred thirty-one million, six hundred eighty-four thousand, five hundred six".